JPH0533770Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention is a blocking clip used for filling screw holes, especially after removing scaffolding bolts screwed into utility poles as scaffolding. This invention relates to a closing clip that is effective for closing the screw holes of.

[Prior art] Scaffolding bolts are installed on utility poles to provide a foothold for workers, but if they are left as they are, there is a danger that people other than the workers will climb onto the poles, so they should be placed on the ground. Bolts are not installed in nearby areas or are removed after work, but if bolts are not installed, a ladder etc. must be prepared each time, so it is necessary to prepare the nuts for installing bolts on concrete poles. The method used is to bury the bolt in the ground and then use this nut to install the bolt.

However, since it is still troublesome to remove the bolt each time it is not in use, the nut to be buried is formed into a cylindrical shape long enough to pass from the surface of the utility pole into the hollow part in the center, and the nut is inserted into the inner peripheral surface of the outer opening. A large diameter female threaded portion and a small diameter female threaded portion are formed on the inner circumferential surface of the inner opening, while a small male threaded portion that matches the small diameter female threaded portion is formed on the insertion side tip of the bolt. The rear end of the bolt is formed with a large male thread that matches the large diameter female thread, and when in use, the small male thread is screwed into the female thread of the inner opening of the nut to tighten the rear end of the bolt. It protrudes from the surface of the utility pole and is used as a foothold, while when not in use, the bolt is screwed in, the small male thread at the tip penetrates inside the small diameter female thread, and the bolt is inserted into the hollow part of the utility pole. A structure has been developed and used in which the large male thread at the rear end of the bolt is screwed into a large diameter female thread so that the entire bolt is stored inside the utility pole.

This bolt that can be freely inserted and removed is convenient for actual work, but if it is not going to be used for a long time or if there is a risk of someone other than the worker climbing on it, it is better to remove the bolt from the standpoint of safety management. There are many things. However, if you simply leave the bolt removed, there is a risk that something like a scaffolding rod may be inserted into the screw hole of this nut.

[Problems to be solved by the invention] The present invention was devised for the purpose of avoiding the risk of unauthorized use of the screw hole of a nut, and its main purpose is to prevent the exposed nut from being used. To provide a clip for closing a screw hole that can be reliably closed by a simple method of press-fitting into the screw hole.

[Means for solving the problem] The screw hole closing clip of the present invention can easily close the screw hole by pushing it in by hand or hitting it with a suitable tool such as a hammer. A plate-shaped leg is suspended from the center of the lower surface of the head, and a pair of elastic clamps are folded back toward the head from both sides near the base end of the leg and from both sides of the tip of the leg. The elastic engagement pieces at the proximal end of these two elastic engagement pieces are opened widely by the elastic engagement pieces at the distal ends of the legs, and the distal ends of each elastic engagement piece are extended outwardly. A clip for closing a screw hole, characterized in that a locking claw is provided toward the clip.

In particular, the clip of the present invention has a pair of elastic engagement pieces provided near the base end of the leg and a pair of elastic engagement pieces provided at the tip of the leg, each of which is formed on the inner peripheral surface of both openings of a nut to be embedded in a utility pole. By engaging both internally threaded parts, the nut can be more firmly attached, while the head at the upper end of the leg closes the opening of the nut to prevent any rods from being inserted. .

Hereinafter, this invention will be explained with reference to illustrated embodiments, and its features will be clarified.

Figure 1 is a perspective view of the closure clip according to the present invention, Figure 2 is a front view, Figure 3 is a side view, and Figure 4 is a side view.
The figure is a bottom view, and the reference numeral 1 in the drawing is a head, 2 is a leg, and 3 and 4 are elastic engagement pieces.

The head 2 is formed into a disk shape, and the legs 2 are suspended from the center of the lower surface.

The leg 2 is formed into a vertically long rectangular plate shape with a required wall thickness, and both corners of the tip of the leg are cut off to form a tapered surface 5. In this embodiment, V-shaped notches 6 are provided facing each other at approximately mid-length positions,
A mark line 7 is provided so as to connect both of the notches 6, and a cutting portion is provided for cutting off the tip end of the leg.

One of the two elastic engagement pieces 3
extend from both sides of the proximal end of the leg near the head 1 toward the lower surface of the head so as to form a substantially V-shape, and the other elastic engagement piece 4 extends from the tip of the leg toward the lower surface of the head. It is also extended to form a V-shape.

These elastic engagement pieces 3 and 4 are formed such that the elastic engagement piece 3 at the base end has a wide width between its tips, and the elastic engagement piece 4 at the leg tip has a narrow width between its tips. Here, both elastic engagement pieces 3 on the proximal end side have thicker bases than the engagement pieces 4 on the leg tip side, and are wider in width to provide stronger elastic repulsion.

In this embodiment, both the elastic engagement pieces 3,
An auxiliary elastic engagement piece 8, which is the same as the elastic engagement piece 4, extends from both surfaces near the cut portion approximately in the middle of the elastic engagement piece 4.

Each of these elastic engagement pieces 3, 4 and 8 is connected to a female screw portion 1 of a nut 10, 11 to be buried in a utility pole 9, which will be described later.
2 and 13, and a chevron-shaped engaging claw 14 is provided on the outer surface of the tip of each engaging piece.

The clip of the present invention is constructed as described above and is integrally molded from thermoplastic synthetic resin having appropriate elasticity and rigidity. Next, the actual use of the click of this invention will be explained with reference to FIG.

As mentioned above, the clip of the present invention is mainly used here as a closing clip for closing the screw hole of the screw nut 10 (or 11) of the scaffolding bolt 15 buried in the utility pole. It is integrally molded from thermosetting synthetic resin, and is embedded inside the pole with the surrounding wall inserted during manufacture. Then, this nut expands the inner circumferential surface of the opening on the front side, and inserts a large-diameter female screw part 1 here.
2, a small diameter female screw part 13 on the inner peripheral surface of the inner opening.
When the male threaded portion 16 provided at the tip of the scaffolding bolt 15 is screwed into the small diameter female threaded portion 13, the rear end of the bolt 15 protrudes outside the utility pole and is used as a scaffold (in the drawings). (see), which allows the scaffolding bolt 15 to pass through the inside of the nut and be stored inside the utility pole 9 when this screw is unscrewed and the male threaded portion 17 at the rear end of the bolt is screwed into the large diameter female threaded portion 12. It is as follows.

Now, the clip of the present invention is used for this nut after removing the bolt 15. After the bolt 15 is pulled out, the tip of the leg is inserted through the opening on the front side of the hollow nut 10, and the head is 1 and push it straight in as it is, the elastic engagement piece 4 at the tip of the V-shaped leg will bend and enter the inside of the nut, followed by the auxiliary elastic engagement piece 8. do.
When it is pushed in further, the elastic engagement piece 3 of the stem end that has been opened further enters the large diameter female thread formed on the inner peripheral surface of this opening, and at the same time, the elastic engagement piece 3 that entered earlier enters the opening. The tips of the mating pieces 4 reach the small-diameter female threads 13, and the engaging claws 14 provided at these tips engage with each part of each female thread, making it impossible to pull out. . Then, when the pushing of the legs is completed, the head 1 covers the surface side of the nut and closes the screw hole.

In addition to pushing in by hand, the clip can be pushed in by hitting it with a hammer or the like, but in order to obtain a stronger engagement, the elastic engagement piece 3 at the protruding proximal end is inserted into the female thread. 12, this press-fitting is efficient and has excellent workability.

As described above, the clip of the present invention allows the elastic engagement pieces 3 and 4 provided at the tip and base ends of the legs to be pressed into place by pushing the legs into place.
The clips engage with different female threads individually and exert a strong engagement force, but this clip is made by cutting the tip of the leg at a cut point made halfway along the length of the leg 2. This shortening allows the nut 11 to be used in a short nut shape as shown in FIG. 5.

These short nuts are generally used as nuts for scaffolding bolts that are planted from halfway up to above the height of utility poles, and are used in large quantities, but the clip of this invention is By cutting the leg at the cutting part and making it short, it can be used for two different types of nuts.

[Effects of the invention] As explained above, the clip of the present invention is easy to attach by simply pushing it into the screw hole, and the spring force of the elastic engagement piece works, making it easy to attach. Since the locking claws of the elastic engagement pieces individually engage with the respective female screw portions to prevent them from being pulled out, reliable closure can be expected.

In addition, the closure clip of the present invention can be used in cases where the inner thread of a cylindrical nut that screws a freely removable scaffolding bolt collapses due to the load applied to the bolt, etc. Since the elastic engagement piece engages with the female threaded portion on the front side and compensates for this, there is an advantage that strong closure can always be guaranteed.

Of course, the clip of this invention can be integrally molded with synthetic resin, making it suitable for mass production, and it can also be used for two different types of screw holes depending on the cutting of the legs, making it easy to handle on site. be.

[Brief explanation of the drawing]

The drawing shows one embodiment of the present invention.
The figure is a perspective view, the second figure is a front view, the third figure is a side view,
FIG. 4 is a bottom view, and FIG. 5 is a longitudinal sectional view for explaining actual use. 1...Head, 2...Leg, 3, 4...Elastic engagement piece, 14...Engagement piece.

Claims (1)

[Scope of utility model registration request] A clip for closing a screw hole, characterized in that a leg is hung down from the center of the underside of the head, and a pair of elastic engagement pieces are extended from both sides near the base end of the leg and both sides at the tip of the leg so as to fold back towards the head, the elastic engagement piece at the base end of both elastic engagement pieces being wider than the elastic engagement piece at the tip of the leg, and a locking claw is provided at the tip of each elastic engagement piece facing outward.